The ActivePython Python distribution is a distribution focusing on an easy install and use. It provides builds for a number of platforms: Linux, Windows, Mac OS X, Solaris, HP-UX and AIX. On Windows, ActivePython also includes Win32All (a.k.a. pywin32).
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In addition, ActiveState provides a quality assured enterprise version, OEM licensing, CD/DVD distribution, and support which may be attractive to some customers. Another product of ActiveState is Komodo IDE which is a useful IDE for Python and other scripting languages. Since November 2007, there is a open source version of the Komodo IDE available, called OpenKomodo.
ActiveState is one of the most well known and one of the longest running suppliers of Python distributions, tools, and support.